• Title/Summary/Keyword: thermoelectric properties

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Properties of Fireproof Mortar Using Lightweight Fine Aggregate Using Air Cooling Process Bottom Ash (건식공정 바텀애시 경량 잔골재를 사용한 내화모르타르의 특성)

  • Kim, Myung-Hoon;Namkoong, Yeon
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2016.05a
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    • pp.225-226
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    • 2016

  • Bottom ash generated in thermoelectric power plants could be used as substitutional fine aggregate such as pearlite of fireproof mortar due to its lightweight and porosity. Development of substitutional materials is necessary because pearlite has several problems such as production of carbon dioxide during manufacturing process and high price. This study is to confirm the possibility of air cooling process bottom ash for fireproof mortar as substitutional material of pearlite through basic experiment.

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One-dimensional Bi-Te core/shell structure grown by a stress-induced method for the enhanced thermoelectric properties

  • Kang, Joo-Hoon;Ham, Jin-Hee;Lee, Woo-Young
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2009.04b
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    • pp.47-47
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    • 2009

  • The formation of variable one-dimensional structures including core/shell structure is of particular significance with respect to potential applications for thermoelectric devices with the enhanced figure of merit ($ZT=S2{\sigma}T/{\kappa}$). We report the fabrication of Bi-Te core/shell nanowire based on a novel stress induced method. Fig. 1 schematically shows the nanowire fabrication process. Bi nanowires are grown on the Si substrate by the stress-induced method, and then Te is evaporated on the Bi nanowires. Fig. 2 is a transmission electron microscopy image clearly showing a core/shell structure for which effective phonon scattering and quantum confinement effect are expected. Electrical conductivity of the core/shell nanowire was measured at the temperatures from 4K to 300K, respectively. Our results demonstrate that Bi-Te core/shell nanowire can be grown successfully by the stress-induced method. Based on the result of electrical transport measurement and characteristic morphology of rough surface, Seebeck coefficient and thermal conductivity of Bi-Te core/shell nanowires are presented.

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MOCVD of $Bi_2Te_3$-based thermoelectric materials and their material characteristics (MOCVD법으로 성장된 열전재료용 $Bi_2Te_3$ 박막의 특성)

  • Kim, Jeong-Hun;Jung, Yong-Chul;Suh, Sang-Hee;Ju, Byeong-Kwon;Kim, Jin-Sang
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2005.11a
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    • pp.13-15
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    • 2005

  • The growth of $Bi_2Te_3$ thin films on (001) GaAs substrates by metal organic chemical vapour deposition (MOCVD) is discussed in this paper. The results of surface morphology, electrical and thermoelectrical properties as a function of growth parameters are given. The surface morphologies of $Bi_2Te_3$ films were strong1y dependent on the deposition temperatures. Surface morphologies varied from step-flow growth mode to island coalescence structures depending on deposition temperature. In-plane carrier concentration and electrical Hall mobility were highly dependent on precursor's ratio of Te/Bi and deposition temperature. The high Seebeck coefficient (of $-160{\mu}VK^{-1}$) and good surface morphology of our result is promising for $Bi_2Te_3$ based thermoelectric thin film and two dimensional supperlattice device applications.

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